Malicious PDF — malware analysis report

Static analysis result for SHA-256 347bbfdcdf684229…

MALICIOUS

PDF

87.3 KB Created: 2021-06-28 13:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67ad1ce99a6e98a54bff96fecc49a521 SHA-1: 8cf22c1c2da8b43374dc6b0a93f041a77bad0549 SHA-256: 347bbfdcdf68422929c1b4591c806508e638c0bcdfe7c5f4c2b0221829d50c79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. These links likely serve as redirects to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd138723402---fozejimoze.pdf
    • http://camwater.org/media/files/sefurobazukatijevi.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b69d1993d7d---zodubaxikenosatawonutarot.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b25e274dd21---77396601813.pdf
    • http://technoculture.cz/admin/upload/file/36144464964.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f90aa8cca---65324450732.pdf
    • https://ltssinternational.com/res/wysiwyg/file/51052835299.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/73897197449.pdf
    • http://gold-carsales.com/js/upload/files/tagetegiti.pdf
    • http://esipro.fr/userfiles/file/mijixevuwamufesokewusa.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/kk4l7vmuq4pffqle9fgr41q2f6/64837149145.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/bae06a0b9f53663e36cd0c64549248c6/guzixuburuluwofiv.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd9896f7a---memedimomotimafu.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c45fb771e27---fekomexuj.pdf
    • http://goodwill.pl/userfiles/file/87636221044.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d823760b1---subopivanuwibanax.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b013d6f0647---pojilutilazumafigefig.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16233730032064.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/l3mr8posul0on3s3dnifhtpm1h/nafikumizigisatupof.pdf
    • http://www.knickmeier.net/images/pageimg/file/93486742951.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=coming+of+age+reading+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 16792 bytes
font_01_sfnt_off00010aee.bin
4c1aeb597ae9fdf369556e1737aaee7cebde5dcb149a7467a932c59dc27ec971
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 10668 bytes
font_02_sfnt_off00012338.bin
5704498e0e996d70f77525cc4a37cbd76fb0fc839c207cbce31aaf644eaec350
pdf-font-stream PDF embedded font (sfnt) at offset 0x12338 17008 bytes